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You searched for: subject:"aircraft reliability"
[texts]Frozen Smoke - NON
Under a NASA SBIR (Small Business Innovative Research) contract with Johnson Space Center, Aspen Systems developed aerogel-based superinsulation. This super-insulation is an innovative, flexible cryogenic insulation with extremely low thermal conductivity. Potential commercial uses include cryogenic applications in the transportation, storage and transfer of cryogens; near room-temperature applications such as refrigerator insulation; and elevated temperature applications such as insulations for...
Keywords: COCKPITS; AIRCRAFT RELIABILITY; RADIO COMMUNICATION; MALFUNCTIONS; INTERRUPTION; SYSTEM FAILURES; TAXIING; SWITCHING; LANDING GEAR; AUTOMATIC PILOTS
Downloads: 26
[texts]ALGORITHM FOR COMPUTING SATELLITE ORIENTATION. VALUES OF THE GRAVITATIONAL CONSTANTS - ELYASBERG, P. E.
AN ALGORITHM IS PRESENTED FOR COMPUTING SATELLITE ORIENTATION ALONG WITH TABLES OF GRAVITATIONAL CONSTANTS USED IN THE COMPUTATION.
Keywords: AERODYNAMIC CHARACTERISTICS; AIRCRAFT ENGINES; FLIGHT SAFETY; MULTIENGINE VEHICLES; AIRCRAFT CONTROL; AIRCRAFT PERFORMANCE; AIRCRAFT RELIABILITY
Downloads: 115
[texts]Integrated cockpit for A-129 - Reina, F.
Weight, size, and mission requirements for the A-129 mandated an integrated system approach for the crew/cockpit interface design. Instead of the usual multitude of cockpit controls, indicators, gauges, and lights, the primary crew interface is a single multifunction keyboard and one or more multifunction CRT display units. This cockpit design approach imposed unusual constraints upon the system architecture to overcome the inherent information access limitations of a data input/output window th...
Keywords: COMBAT; WEAPON SYSTEMS; EFFECTIVENESS; HELICOPTER PERFORMANCE; MANEUVERABILITY; MILITARY HELICOPTERS; AIRCRAFT RELIABILITY; CONTROLLABILITY; FEEDBACK CONTROL; HELICOPTER CONTROL
Downloads: 125
[texts]Redundancy of hydraulic flight control actuators - Chenoweth, C. C.
The constraint of requiring airplanes to have inherent aerodynamic stability can be removed by using active control systems. The resulting airplane requires control system reliability approaching that of the basic airframe. Redundant control actuators can be used to achieve the required reliability, but create mechanization and operational problems. Of numerous candidate systems, two different approaches to solving the problems associated with redundant actuators which appear the most likely to ...
Keywords: AIRCRAFT CONTROL; AIRCRAFT RELIABILITY; CONTROL THEORY; FLIGHT CHARACTERISTICS; CIVIL AVIATION; FLIGHT SAFETY; MANEUVERABILITY; TRANSPORT AIRCRAFT
Downloads: 287
[texts]Molecules from Space and the Origin of Life - Bernstein Max P.
There is a growing concensus among space scientists that frozen molecules from space helped to make the Earth the pleasant place that it is today, and helped Life start on Earth, and perhaps elsewhere. The chain of logic that led scientists to posit a connection between extraterrestrial molecules and the origin of life is as follows. 1) The rapidity with which life arose demands that conditions on Earth were conducive to the formation of life very early on...
Keywords: ROTARY WING AIRCRAFT; MILITARY AVIATION; AIRCRAFT DESIGN; AIRCRAFT RELIABILITY; LOADING; QUALIFICATIONS; CONTROLLABILITY; AEROSERVOELASTICITY; MILITARY OPERATIONS; FLIGHT TESTS; AUTOMATIC FLIGHT CONTROL
Downloads: 90
[texts]Study of cosmic rays in the solar environment Final technical report - NON
Behavior of cosmic rays in solar environment plasma
Keywords: EDUCATION; HELICOPTER PERFORMANCE; MATERIALS TESTS; HANDBOOKS; ROTARY WING AIRCRAFT; AERODYNAMIC STABILITY; AIRCRAFT RELIABILITY; COMPONENT RELIABILITY; FLIGHT MECHANICS; FRANCE; HELICOPTER DESIGN
Downloads: 110
[texts]3-D High-Lift Flow-Physics Experiment - Transition Measurements - McGinley, Catherine B.
An analysis of the flow state on a trapezoidal wing model from the NASA 3-D High Lift Flow Physics Experiment is presented. The objective of the experiment was to characterize the flow over a non-proprietary semi-span three-element high-lift configuration to aid in assessing the state of the art in the computation of three-dimensional high-lift flows. Surface pressures and hot-film sensors are used to determine the flow conditions on the slat, main, and flap...
Keywords: BAYES THEOREM; AIRCRAFT RELIABILITY; AIRCRAFT CONTROL; AIRCRAFT DESIGN; CONTROL MOMENT GYROSCOPES; SELF ADAPTIVE CONTROL SYSTEMS; ROBOT CONTROL
Downloads: 83
[texts]Advanced automation for space missions: Technical summary - NON
Several representative missions which would require extensive applications of machine intelligence were identified and analyzed. The technologies which must be developed to accomplish these types of missions are discussed. These technologies include man-machine communication, space manufacturing, teleoperators, and robot systems.
Keywords: AIRCRAFT RELIABILITY; STABILITY DERIVATIVES; FLIGHT SIMULATION; INSTRUMENT APPROACH; PITCHING MOMENTS; ROLLING MOMENTS; ROTARY WING AIRCRAFT; YAWING MOMENTS; AERODYNAMIC COEFFICIENTS; HELICOPTERS
Downloads: 161
[texts]Modeling Modern Methane Emissions From Natural Wetlands - Walter, Bernadette P.
Methane is an important greenhouse gas which contributes about 22% to the present greenhouse effect. Natural wetlands currently constitute the biggest methane source and were the major one in pre-industrial times. Wetland emissions depend highly on the climate, i.e., on soil temperature and water table. In order to investigate the response of methane emissions from natural wetlands to climate variations, a process-based model that derives methane emissions from natural wetlands as a function of ...
Keywords: AIRCRAFT RELIABILITY; GENERAL AVIATION AIRCRAFT; AIRCRAFT SAFETY; COMPLEX SYSTEMS; RANDOM SAMPLING; GOODNESS OF FIT; BIAS; DATA PROCESSING
Downloads: 81
[texts]The role of voice technology in advanced helicopter cockpits - Harper, H. P
The status of voice output and voice recognition technology in relation to helicopter cockpit applications is described. The maturing of this technology provides many opportunities for new approaches to crew workload reduction. The helicopter operating environment, potential application areas, and the impact on advanced cockpit design are discussed.
Keywords: AIRCRAFT RELIABILITY; PERFORMANCE TESTS; QUALITY CONTROL; AVIONICS; CERTIFICATION; CIVIL AVIATION; FLIGHT TESTS; MILITARY HELICOPTERS; AUTOMATIC FLIGHT CONTROL; EVALUATION; HELICOPTER CONTROL
Downloads: 91
[texts]Why Does It Cost How Much - Dean, Edwin B
There is great concern for the competitiveness of the aerospace industry today. This paper examines the concept of competitiveness by relating the levels of the genopersistation recursion to cost.
Keywords: AERONAUTICAL ENGINEERING; AIRCRAFT INSTRUMENTS; SENSORS; AIRCRAFT DESIGN; MEASURING INSTRUMENTS; TECHNOLOGY UTILIZATION; AIRCRAFT RELIABILITY; AIRCRAFT SAFETY; NASA PROGRAMS
Downloads: 58
[texts]Progress in the development of high degree potential coefficient models - Rapp, Richard H
A natural extension of the recent satellite derived potential coefficient models is the development of high degree (maximum 180 or 360) expansions. Such expansions are based on the combination of the satellite derived models with terrestrial gravity data and satellite altimeter data. Such models are useful for more precise geoid undulation computations, for simulation studies involving different typed of future missions (e.g., gradiometry), and as reference fields for different types of gravimet...
Keywords: AIRCRAFT DESIGN; TABLES (DATA); AIRCRAFT RELIABILITY; DATA RECORDERS; FLIGHT RECORDERS; L-1011 AIRCRAFT; DESIGN ANALYSIS; DIGITAL SYSTEMS; GRAPHS (CHARTS); STATISTICAL ANALYSIS
Downloads: 44
[texts]High order filtering methods for approximating hyberbolic systems of conservation laws - Lafon, F.
In the computation of discontinuous solutions of hyperbolic systems of conservation laws, the recently developed essentially non-oscillatory (ENO) schemes appear to be very useful. However, they are computationally costly compared to simple central difference methods. A filtering method which is developed uses simple central differencing of arbitrarily high order accuracy, except when a novel local test indicates the development of spurious oscillations...
Keywords: AIRCRAFT DESIGN; TABLES (DATA); AIRCRAFT RELIABILITY; BOEING 747 AIRCRAFT; DATA RECORDERS; DESIGN ANALYSIS; FLIGHT RECORDERS; STATISTICAL ANALYSIS; DIGITAL SYSTEMS; GRAPHS (CHARTS)
Downloads: 52
[texts]Flap/Lag/Torsion Dynamics of a Uniform, Cantilever Rotor Blade in Hover - Johnson, W
The dynamic stability of the flap/lag/torsion motion of a uniform, cantilever rotor blade in hover is calculated. The influence of blade collective pitch, lag frequency, torsional flexibility, structural coupling, and precone angle on the stability is examined. Good agreement is found with the results of an independent analytical investigation.
Keywords: AIRCRAFT DESIGN; MATHEMATICAL MODELS; PROBLEM SOLVING; STOCHASTIC PROCESSES; AIRCRAFT RELIABILITY; CONFERENCES; RELIABILITY ENGINEERING; SYSTEMS ENGINEERING; AIRCRAFT CONTROL; CONTROL THEORY; DECISION MAKING; FEEDBACK CONTROL
Downloads: 180
[texts]Wake Vortex Wingtip-Turbine Powered Circulation Control High-Lift System - Moore, Mark D
NASA s Vehicle Systems Program is investing in aeronautics technology development across six vehicle sectors, in order to improve future air travel. These vehicle sectors include subsonic commercial transports, supersonic vehicles, Uninhabited Aerial Vehicles (UAVs), Extreme Short Takeoff and Landing (ESTOL) vehicles, Rotorcraft, and Personal Air Vehicles (PAVs). While the subsonic transport is firmly established in U.S...
Keywords: ENGINE CONTROL; RELIABILITY ENGINEERING; ENGINE FAILURE; NEURAL NETS; CONTROL SYSTEMS DESIGN; AIRCRAFT ENGINES; AIRCRAFT RELIABILITY; REDUNDANCY; FEEDBACK CONTROL; FEEDFORWARD CONTROL; SYSTEMS SIMULATION
Downloads: 120
[texts]Pressure Recovery for Missiles with Reaction Propulsion at High Supersonic Speeds (The Efficiency of Shock Diffusers) - Oswatitsch, K
The problem of the intake of air is treated for a missile flying at supersonic speeds and of changing the kinetic energy of the air into pressure with the least possible losses. Calculations are carried out concerning the results which can be attained. After a discussion of several preliminary experiments, the practical solution of the problem at hand is indicated by model experiments. The results proved very satisfactory in view of the results which had been attained previously and the values w...
Keywords: AIRLINE OPERATIONS; QUALITY CONTROL; AIRCRAFT RELIABILITY; AIRCRAFT PERFORMANCE; AIRCRAFT SAFETY; QUALITY; RATINGS; CIVIL AVIATION; COMMERCIAL AIRCRAFT; PASSENGER AIRCRAFT; CONSUMERS; Q FACTORS; FIGURE OF MERIT
Downloads: 123
[texts]Automated design of minimum drag light aircraft fuselages and nacelles - Smetana, F. O.
The constrained minimization algorithm of Vanderplaats is applied to the problem of designing minimum drag faired bodies such as fuselages and nacelles. Body drag is computed by a variation of the Hess-Smith code. This variation includes a boundary layer computation. The encased payload provides arbitrary geometric constraints, specified a priori by the designer, below which the fairing cannot shrink...
Keywords: AIRCRAFT RELIABILITY; MATHEMATICAL MODELS; STABILITY AUGMENTATION; TURBULENCE; WIND EFFECTS; DIRECTIONAL CONTROL; FLIGHT CONTROL; FLIGHT SIMULATION; MILITARY HELICOPTERS; AIRCRAFT SPECIFICATIONS; DISPLAY DEVICES; LATERAL CONTROL; LONGITUDINAL CONTROL
Downloads: 110
[texts]GRID2D/3D: A computer program for generating grid systems in complex-shaped two- and three-dimensional spatial domains. Part 2: User's manual and program listing - Bailey, R. T.
An efficient computer program, called GRID2D/3D, was developed to generate single and composite grid systems within geometrically complex two- and three-dimensional (2- and 3-D) spatial domains that can deform with time. GRID2D/3D generates single grid systems by using algebraic grid generation methods based on transfinite interpolation in which the distribution of grid points within the spatial domain is controlled by stretching functions...
Keywords: AIRCRAFT DESIGN; TABLES (DATA); AIRCRAFT RELIABILITY; DATA RECORDERS; DC 10 AIRCRAFT; FLIGHT RECORDERS; STATISTICAL ANALYSIS; DESIGN ANALYSIS; DIGITAL SYSTEMS; GRAPHS (CHARTS)
Downloads: 145
[texts]Satellite radar altimetry over ice. Volume 2: Users' guide for Greenland elevation data from Seasat - Zwally, H. Jay
A gridded surface-elevation data set and a geo-referenced data base for the Seasat radar altimeter data over Antarctica are described. It is intended to be a user's guide to accompany the data provided to data centers and other users. The grid points are on a polar stereographic projection with a nominal spacing of 20 km. The gridded elevations are derived from the elevation data in the geo-referenced data base by a weighted fitting of a surface in the neighborhood of each grid point...
Keywords: AIRCRAFT DESIGN; TABLES (DATA); AIRCRAFT RELIABILITY; BOEING 727 AIRCRAFT; DATA RECORDERS; FLIGHT RECORDERS; STATISTICAL ANALYSIS; DESIGN ANALYSIS; DIGITAL SYSTEMS; GRAPHS (CHARTS)
Downloads: 158
[texts]Individual Differences in Response to Sleep Deprivation: Assessment of Fatigue Following Sleep Loss - Carskadon, Mary A
Previous work has indicated that a small but significant number of participants in sleep deprivation studies or in simulated shift work experiments manifests an exaggerated performance decrement when they reach a critical point in the experiment, usually near the trough of the circadian cycle or the middle of the night. Those who show this exaggerated response do not appear to differ from other non-nal volunteers in any substantial way according to usual screening criteria or baseline values...
Keywords: AIRCRAFT MAINTENANCE; AIRCRAFT SAFETY; CORROSION; CORROSION PREVENTION; INSPECTION; QUALITY CONTROL; NONDESTRUCTIVE TESTS; AIRFRAMES; FUSELAGES; CRACKING (FRACTURING); AGING (MATERIALS); FATIGUE (MATERIALS); STRUCTURAL RELIABILITY; CUMULATIVE DAMAGE; AIRCRAFT STRUCTURES; AIRCRAFT RELIABILITY; CONFERENCES; FRACTURE MECHANICS
Downloads: 71
[texts]On the Coupling of CDISC Design Method with FPX Rotor Code - Hu, Hon
A rotor section aerodynamics design package is developed by coupling Constrained Direct Iterative Surface Curvature (CDISC) design method with the FPX rotor code. The coupling between the CDISC design and the FPX flow analysis is fully automated. The CDISC design method employs a predictor-corrector procedure iteratively to determine a surface geometry which produces a target pressure distribution, where the target pressure distributions is either pre-defined or automatically generated through f...
Keywords: X-43 VEHICLE; ENGINE AIRFRAME INTEGRATION; AIRCRAFT PERFORMANCE; MACH NUMBER; AEROSPACE SYSTEMS; COSTS; HYPERSONIC SPEED; SPACE TRANSPORTATION; AIRCRAFT RELIABILITY; HYPERSONIC FLIGHT; RESEARCH VEHICLES; FLIGHT TESTS; AIRCRAFT DESIGN; NATIONAL AEROSPACE PLANE PROGRAM; AERODYNAMICS; DESIGN ANALYSIS; SUPERSONIC COMBUSTION RAMJET ENGINES
Downloads: 57
[texts]Microgravity Science and Applications. Program Tasks and Bibliography for FY 1993 - NON
An annual report published by the Microgravity Science and Applications Division (MSAD) of NASA is presented. It represents a compilation of the Division's currently-funded ground, flight and Advanced Technology Development tasks. An overview and progress report for these tasks, including progress reports by principal investigators selected from the academic, industry and government communities, are provided...
Keywords: FINITE ELEMENT METHOD; GEARS; METAL GRINDING; NOISE REDUCTION; WEIGHT REDUCTION; HELICOPTER PROPELLER DRIVE; NUMERICAL CONTROL; ROLLER BEARINGS; ROTARY WING AIRCRAFT; TRANSMISSIONS (MACHINE ELEMENTS); AIRCRAFT RELIABILITY; AIRCRAFT SAFETY; COMPUTER PROGRAMS
Downloads: 455
[texts]Performance evaluation of a kinesthetic-tactual display - Jagacinski, R. J.
Simulator studies demonstrated the feasibility of using kinesthetic-tactual (KT) displays for providing collective and cyclic command information, and suggested that KT displays may increase pilot workload capability. A dual-axis laboratory tracking task suggested that beyond reduction in visual scanning, there may be additional sensory or cognitive benefits to the use of multiple sensory modalities...
Keywords: AIRCRAFT SPECIFICATIONS; AIRCRAFT INSTRUMENTS; AIRCRAFT MANEUVERS; AIRCRAFT RELIABILITY; AIRCRAFT SURVIVABILITY; ALL-WEATHER AIR NAVIGATION; AUTOMATIC FLIGHT CONTROL; COMBAT; CONTROL BOARDS; DISPLAY DEVICES; FLIGHT CONTROL; AVIONICS; HELICOPTER PERFORMANCE; RADAR NAVIGATION; STABILITY AUGMENTATION; COCKPITS; CONFERENCES; CONTROLLABILITY; HELICOPTER CONTROL; MANEUVERABILITY; NAP-OF-THE-EARTH NAVIGATION; NIGHT FLIGHTS (AIRCRAFT)
Downloads: 83
[audio]MIT 16.885J Aircraft Systems Engineering, Fall 2005 - MIT OpenCourseWare
16.885J offers a holistic view of the aircraft as a system, covering: basic systems engineering; cost and weight estimation; basic aircraft performance; safety and reliability; lifecycle topics; aircraft subsystems; risk analysis and management; and system realization. Small student teams retrospectively analyze an existing aircraft covering: key design drivers and decisions; aircraft attributes and subsystems; and operational experience...
Keywords: aircraft systems; aircraft systems engineering; lifecycle; cost estimation; weight estimation; aircraft performance; aircraft safety; aircraft reliability; subsystems; risk analysis; risk management; system realization; retrospective analysis; key design drivers; design drivers; design decisions; aircraft attributes; operational experience; case study; case studies; air transportation system; air defense system; systems engineering; interface management; interface verification; interface validation; subsystem architecture; performance issues; design closure; complex systems; space shuttle; space systems; NASA; aircraft systems; aircraft systems engineering; lifecycle; cost estimation; weight estimation; aircraft performance; aircraft safety; aircraft reliability; subsystems; risk analysis; risk management; system realization; retrospective analysis; key design drivers; design drivers; design decisions; aircraft attributes; operational experience; case study; case studies; air transportation system; air defense system; systems engineering; interface management; inte
Downloads: 155
[movies]16.885J / ESD.35J Aircraft Systems Engineering Fall 2005 - MIT OpenCourseWare
16.885J offers a holistic view of the aircraft as a system, covering: basic systems engineering; cost and weight estimation; basic aircraft performance; safety and reliability; lifecycle topics; aircraft subsystems; risk analysis and management; and system realization. Small student teams retrospectively analyze an existing aircraft covering: key design drivers and decisions; aircraft attributes and subsystems; and operational experience...
Keywords: space shuttle; space systems; NASA; aircraft systems; aircraft systems engineering; lifecycle; cost estimation; weight estimation; aircraft performance; aircraft safety; aircraft reliability; subsystems; risk analysis; risk management; system realization; retrospective analysis; key design drivers; design drivers; design decisions; aircraft attributes; operational experience; case study; case studies; air transportation system; air defense system; systems engineering; interface management; interface verification; interface validation; subsystem architecture; performance issures; design closure; complex systems
Downloads: 51,654
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